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Sheet forming die and sheet forming methodSheet forming die and sheet forming method description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090263529, Sheet forming die and sheet forming method. Brief Patent Description - Full Patent Description - Patent Application Claims
1. Field of the Invention The present invention relates to a sheet forming die and a sheet forming method. The present invention relates for example to a die and a method for forming a sheet by dividing a supplied molten resin into flows, and thereafter by joining the divided flows of the molten resin together. 2. Description of the Related Art There has been known a method for manufacturing a laminated film formed of a number of thermoplastic resin layers by co-extrusion lamination using a multi-manifold die. By this method, the film to be laminated is expanded to a standard width, and thereafter the two side edge portions of the film are coated in the die with a single resin. For this method, there has been known a multi-manifold die including side plates which are provided on its two respective sides. In addition, the multi-.manifold die includes a resin passage and a resin discharge port which are drilled in each of the side plates. The resin passage branches from, and communicates with, one of its resin inflow ports. The resin discharge port is configured to discharge the resin for coating the two side edge portions of the laminated film, as disclosed in the Japanese Patent Brochure, Japanese Patent Application Laid-Open No. Hei. 6-91719, for instance. In the method employing the conventional multi-manifold die, the film is expanded to the standard width and then the two side edge portions of the film are encapsulated in the die with the resin. Accordingly, this poses a problem in that the resin to coat the two side edge portions may not smoothly flow to join together with the film at the resin passage outlets (at locations where the resin flows to join together with the film expanded to the standard width), thereby making it difficult to finely control the flow rates of the flowing resin divided for coating the two side edge portions. The present invention has been achieved with such points in mind. It therefore is an object of the present invention to provide a sheet forming die capable of finely controlling with precision the flow rates of the divided flows of the molten resin, and a sheet forming method using this sheet forming die. To achieve the object, according to a first aspect of the present invention, there is provided a sheet forming die: which receives a first molten resin supplied from a first resin extruder; which receives a second molten resin supplied from a second resin extruder; and which forms a sheet-shaped resin-made product by discharging the first molten resin and the second molten resin from a lip gap. The sheet forming die includes: a first passage provided to flow the supplied first molten resin up to an upstream end of a lip part located upstream of the lip gap; a second passage provided to flow the supplied second molten resin up to the lip part, the second passage branching out into a plurality of passageways in a midstream portion thereof, downstream ends of these passageways being connected to portions in an upstream end of the lip part, respectively; and a temperature controller configured to locally control a temperature of a midstream portion of at least one of the passageways in order to control a flow rate of the second molten resin in the passageway. A second aspect of the present invention is the sheet forming die according to the first aspect, which further includes a tubular restrictor constituting member formed as a body divided from the sheet forming die, the restrictor constituting member being provided in a midstream portion of at least one of the passageways. Furthermore, in the sheet forming die, the temperature controller is a unit configured to change a temperature of the restrictor constituting member. A third aspect of the present invention is the sheet forming die according to the second aspect, in which: the sheet forming die is configured by including a die main body and a connection block, the passages are formed so as to extend from the connection block through the die main body, the lip part is formed in the die main body, the second passage branches out in the connection block, the restrictor constituting member is set in a connection portion of the die main body and the connection block, and the restrictor constituting member is configured so as to be mounted integrally with the die main body and the connection block when the connection block is mounted on the die main body. A fourth aspect of the present invention is a sheet forming die: which receives a first molten resin supplied from a first resin extruder; which receives a second molten resin supplied from a second resin extruder; and which forms a sheet-shaped resin-made product by discharging the first molten resin and the second molten resin from a lip gap. The sheet forming die includes: a first passage provided to flow the supplied first molten resin up to an upstream end of a resin supplying passage located upstream of a lip part located upstream of the lip gap; a second passage provided to flow the supplied second molten resin up to the resin supplying passage, the second passage branching out into a plurality of passageways in a midstream portion thereof, downstream ends of these passageways being connected to portions in an upstream end of the resin supplying passage, respectively; and a temperature controller configured to locally control a temperature of a midstream portion of at least one of the passageways in order to control a flow rate of the second molten resin in the passageway. A fifth aspect of the present invention is the sheet forming die according to the fourth aspect, which further includes a tubular restrictor constituting member formed as a body divided from the sheet forming die, the restrictor constituting member being provided in a midstream portion of at least one of the passageways. Furthermore, in the sheet forming die, the temperature controller is a unit configured to change a temperature of the restrictor constituting member. A sixth aspect of the present invention is the sheet forming die according to the fifth aspect, in which: the sheet forming die is configured by including a die main body, a feed block connected to the die main body, and a connection block connected to the feed block, the passages are formed so as to extend from the connection block to the feed block, the resin supplying passage is formed so as to extend from the feed block through the die main body, the lip part is formed in the die main body, the second passage branches out in the connection block, the restrictor constituting member is set in a connection portion of the feed block and the connection block, and the restrictor constituting member is configured so as to be mounted integrally with the feed block and the connection block when the connection block is mounted on the feed block. A seventh aspect of the present invention is a sheet forming die: which receives a molten resin supplied from a resin extruder; and which forms a sheet-shaped resin-made product by discharging the supplied molten resin from a lip gap. The sheet forming die includes: a passage provided to flow the supplied molten resin up to the lip gap, the passage branching out into multiple passageways in a midstream portion thereof, downstream ends of the passageways being connected to portions located upstream of the lip gap, respectively; a tubular restrictor constituting member formed as a body separated from the sheet forming die, the restrictor constituting member being provided in a midstream portion of at least one of the passageways; and a temperature controller configured to control a temperature of the restrictor constituting member in order to control a temperature of a restrictor of the restrictor constituting member. An eighth aspect of the present invention is a sheet forming die: which receives a molten resin supplied from a resin extruder; and which forms a sheet-shaped resin-made product by discharging the supplied molten resin from a lip gap. The sheet forming die includes: a passage provided to flow the supplied molten resin up to the lip gap; a tubular restrictor constituting member formed as a body separated from the sheet forming die, the restrictor constituting member being provided in a midstream portion of the passage; and a temperature controller configured to control a temperature of the restrictor constituting member in order to control a temperature of a restrictor of the restrictor constituting member. A ninth aspect of the present invention is a sheet forming method carried out by use of the sheet forming die according to any one of the first aspect to the eighth aspect. The present invention provides the sheet forming die and the sheet forming method using the sheet forming die, in which a sheet-shaped resin-made product is formed by: receiving the first molten resin supplied from the first resin extruder; receiving the second molten resin supplied from the second resin extruder; and discharging the first molten resin and the second molten resin from the lip gap. Accordingly the present invention is effective in finely controlling the flow rates of the respective divided flows of the molten resin with precision. Continue reading about Sheet forming die and sheet forming method... Full patent description for Sheet forming die and sheet forming method Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Sheet forming die and sheet forming method patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Sheet forming die and sheet forming method or other areas of interest. ### Previous Patent Application: Injection mold friction puller Next Patent Application: Hydraulic drive device for injection molding machine Industry Class: Plastic article or earthenware shaping or treating: apparatus ### FreshPatents.com Support Thank you for viewing the Sheet forming die and sheet forming method patent info. IP-related news and info Results in 2.46609 seconds Other interesting Feshpatents.com categories: Novartis , Pfizer , Philips , Polaroid , Procter & Gamble , paws |
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